Objective 1.6

What is the frequency range of the IEEE 802.11g standard?

2.4 GHz The IEEE 802.11b and IEEE 802.11g both run in the 2.4 GHz RF range.

Which of the following wireless LAN standard devices is least affected by interference from domestic appliances such as microwave ovens?

802.11a The 802.11a wireless LAN standard is least affected by interference from domestic appliances. Most of the domestic devices use the 2.4GHz radio frequency, while the 802.11a standard works on the radio frequency between 5.15 and 5.875GHz. The 802.11a standard provides a wider frequency, supports more channels, and therefore, more data throughput.

Which wireless standard allows channel bonding to increase bandwidth and uses both the 2.4 GHz and 5 GHz frequencies?

802.11n 802.11n uses channel bonding of both the 2.4 GHz range and the 5 GHz range to get increased bandwidth of over 100 Mbps.

A network technician is configuring a wireless router on a company's network and must decide which wireless standard to use for large file transfer at far distance from the router. Which of the following wireless standards will best meet the requirements?

802.11n The technician should use the 802.11n standard. The IEEE 802.11n standard utilizes a concept called channel bonding that allows wireless devices to double their channel from standard 20MHz channels and operate on 40MHz-width channels. An increase in channel width increases bandwidth (>300Mbps). The 802.11n standard also incorporates Multiple-Input Multiple Output (MIMO) technology to achieve superior throughput from wider channels at a reduced sacrifice to signal quality and range. MIMO uses multiple antennas for transmission and reception.

A network technician is troubleshooting a company's network that is experiencing very slow network speeds of 54 Mbps. After assessing the existing wireless network, he recommended an 802.11n network infrastructure. Which of the following allows 802.11n to reach higher speeds?

MIMO Multiple input, multiple output (MIMO) is a technology that allows 802.11n to achieve superior throughput. It uses multiple antennas for transmission and reception that do not interfere with one another by using spatial multiplexing, which encodes data based on the antenna from which the data will be transmitted. Therefore, using 802.11n in the 5GHz range and incorporating MIMO and channel bonding, we can have an increased number of non-overlapping channels.

Which of the following wireless connection types utilize MIMO on non-overlapping channels?

-802.11ac -802.11n Multiple input, multiple output (MIMO) is a technology that allows 802.11n and 802.11ac to achieve superior throughput. It uses multiple antennas for transmission and reception that do not interfere with one another by using spatial multiplexing, which encodes data based on the antenna from which the data will be transmitted. Therefore, using 802.11n or 802.11ac in the 5GHz range and incorporating MIMO and channel bonding, an increased number of non-overlapping channels can be obtained. Also, 802.11ac uses more simultaneous streams than 802.11n and features multi-user MIMO (MU-MIMO).

What is the maximum data rate for the 802.11b standard?

11 Mbps The IEEE 802.11b standard provides a maximum data rate of up to 11 Mbps.

The maximum speed of 802.11b is __________.

11 Mbps The maximum speed of 802.11b is 11 Mpbs. The 802.11b standard uses the 2.4-GHz band and uses the DSSS transmission method.

How many non-overlapping channels are available with IEEE 802.11a standard?

12 The IEEE 802.11a standard provides up to 12 non-overlapping channels, or up to 23 if the 802.11h standard is added.

How wide are the 802.11n channels that provide large bandwidth?

40 MHz 802.11n uses two 20 MHz wide channels to create a 40 MHz wide channel, which provides increased bandwidth of over 100 Mbps.

What is the maximum data rate for the 802.11a standard?

54 Mbps The IEEE 802.11a standard provides a maximum data rate of up to 54 Mbps.

A network technician needs to configure a wireless network for a company but he can't use the 2.4 GHz range because of interference issues. What wireless standard can he choose at the 5 GHz range to get 54 Mbps data rate?

802.11a The IEEE 802.11a standard operates in the 5 GHz range and provides data rate up to 54 Mbps. The 802.11a standard provides a wider frequency, supports more channels, and therefore, more data throughput.

For a small office, a network technician has to design a WLAN which is capable of supporting HD video streaming to multiple devices. Which of the following wireless technologies would be appropriate for this design?

802.11ac 802.11 is a set of IEEE standards that govern wireless networking transmission methods. The most popular variants of the 802.11 standard in use today are 802.11a, 802.11b, 802.11g, 802.11n, and 802.11ac. The 802.11ac is a 5-GHz standard that can use more simultaneous streams than 802.11n and features multi-user MIMO (MU-MIMO). According to the question, to support HD video streaming to multiple devices, a wireless network with fastest speed is required, and this is available with 802.11ac standard.

A network technician is setting up a wireless access point for a SOHO location. The user has demanded exclusive use of the 5GHz band. Which of the following wireless standards should the network technician use for this purpose?

802.11ac The network technician should use the IEEE 802.11ac standard for this purpose. It operates in the 5GHz range and uses more simultaneous streams than 802.11n. It also features multi-user MIMO (MU-MIMO).

In an organization, the users usually connect to wireless APs and have speed of 11 Mbps. Which of the following WLAN standards is in use?

802.11b The wireless APs are configured with 802.11b WLAN standards. The 802.11b WLAN standard supports speeds as high as 11 Mbps. However, 5.5 Mbps is another supported data rate. The 802.11b standard uses the 2.4-GHz band and uses the DSSS transmission method.

Which of the following would increase the bandwidth transmission by joining multiple connections together into one logical connection?

Bonding Bonding allows to connect two or more physical connections and join them to create one logical connection. This provides more bandwidth on the connection.

Spread-spectrum technology is used in wireless networks. What spread-spectrum modulation technique does 802.11b use?

DSSS 802.11b uses the Direct Sequence Spread Spectrum (DSSS). When the 802.11g specification uses 802.11b speeds, it uses the DSSS modulation technique.

Which spread-spectrum technology does the 802.11b standard define for operation?

DSSS The IEEE 802.11b standard uses Direct Sequence Spread Spectrum (DSSS).

802.11n uses MIMO. How does this optimize throughput to achieve the high-speed advantage that 802.11n provides?

Multiple frames are sent by several antennas over different paths and are then recombined by another set of antennas. 802.11n MIMO sends multiple frames by several antennas over different paths. The frames are then recombined by another set of antennas to optimize throughput and multipath resistance. This is called spatial multiplexing.

A company wants to implement an 802.11n wireless network for one of its newly opened office. A network engineer has been asked to conduct an assessment and estimate the number of WAPs needed for the network. Which of the following should the network engineer refer to before making the estimate?

Site survey A wireless site survey, sometimes called an RF site survey or wireless survey, is the process of planning and designing a wireless network, in particular an 802.11 Wi-Fi wireless network, to provide a wireless solution that will deliver the required wireless coverage, data rates, network capacity, roaming capability, and Quality of Service (QoS). The survey usually involves a site visit to run tests to determine the presence of RF interference and identify optimum installation locations for access points. When conducting a wireless site survey, it is very important to identify an effective range boundary, which defines the minimum signal levels needed to support the intended application. This involves determining the minimum SNR needed to support performance requirements.

What does extended service set (ESS) ID mean?

There are more than one access point, and they are in the same SSID connected by a distribution system Extended service set ID means that there are more than one access point, they all are set to the same SSID, and they are all connected together in the same VLAN or distribution system so, users can roam.